Shed, vehicles lost in fire at Kingswood in western Sydney

Almost 100 firefighters have saved several factories from a blaze in western Sydney, but a shed and several shipping containers, trucks and cars have been destroyed.

The fire, which started at Kingswood about 1:00pm (AEST), was fast-moving and quickly threatened businesses in the area, NSW Fire and Rescue Commissioner Greg Mullins said.

"It was actually only a quite small area of grass [on fire] and with the very strong winds the flames were immediately in the backyards of these factories," Commissioner Mullins told 702 ABC Sydney from the scene.

"So at one stage it looked like three factories were on fire.

"Behind me I can see black and brown smoke coming up from a burning semi-trailer, a number of car bodies, shipping containers with tyres in them.

"It's been a very smoky, very hot and very dangerous fire but thankfully no injuries, and the firefighters have worked very hard this afternoon, I'm very proud of them."